I have a bitch that has phantoms. She usually carries on until pretty much when they would have been born. I try to speed up the process by getting her back into a normal routine asap. I don't leave toys lying around she may think are 'puppies' and I also up her exercise. Some bitches go the whole hog and swell up like a balloon and heave and strain like they really have pups. Thank goodness she doesn't go this far. It will sort itself out soon, don't fuss her too much, treat her like a non pregnant dog and hopefully soon she realise shes not one.
Sorry she missed, seems to be a lot of this going round at the moment ( and all to decent breeders)